Viewing Issue Advanced Details
ID Category [?] Severity [?] Reproducibility Date Submitted Last Update
02774 Graphics Minor Always Dec 26, 2008, 17:43 Dec 8, 2018, 02:45
Tester hap View Status Public Platform MAME (Self-compiled)
Assigned To Haze Resolution Fixed OS
Status [?] Resolved Driver seta2.cpp
Version 0.128u7 Fixed in Version 0.205 Build
Fixed in Git Commit Github Pull Request #
Summary 02774: grdians: Occasional 1-frame glitches
Description Sometimes, a single frame will have glitches in it, probably related to the sprite table.
Steps To Reproduce Visible in attract mode:
- at the green alien in the intro
- about 30 seconds into the 2nd demo play
Additional Information
Github Commit
Regression Version
Affected Sets / Systems grdians
Attached Files
png file icon 0029.png (8,913 bytes) Dec 26, 2008, 17:43
png file icon 0042.png (22,700 bytes) Dec 26, 2008, 17:44
There are no relationship linked to this issue.
User avatar
Dec 27, 2008, 14:28
Overclocking the CPU gets rid of the problem, so it might as well be related to interrupt acknowledge, causing a corrupted sprite table instead of just slowdowns.

btw, there's a note in seta2.c "VSync: 58.5Hz", while it's emulated at 60Hz in MAME, changing that doesn't fix this problem though.
User avatar
Senior Tester
Nov 16, 2018, 19:29
edited on: Nov 17, 2018, 18:47
In case it helps, some pcb evidence.
At least the correct alien animation can be seen:
User avatar
Senior Tester
Dec 7, 2018, 17:45
these glitches are now fixed